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Note 15 - Related Party Transactions (Details Textual) - USD ($)
$ / shares in Units, $ in Millions
1 Months Ended
Nov. 30, 2018
Jun. 30, 2022
May 31, 2021
Warrants and Rights Outstanding, Term (Year)   5 years  
Taglich Brothers Inc. [Member]      
Related Party Transaction, Success Fee, Revenue Target Over 200 Million $ 1    
Taglich Brothers Inc. [Member] | Warrants Associated with the February and May 2021 Offerings [Member]      
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares)     82,945
Taglich Brothers Inc. [Member] | Warrants Associated with the February and May 2021 Offerings [Member] | Weighted Average [Member]      
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share)     $ 3.21
Warrants and Rights Outstanding, Term (Year)     5 years